The Evolution Witch powered, protected and controlled the key operations of the Red Oblivion Gate.
The Dimensional Architect monitored the technical parameters of the glowing construct and continued to make minor corrections when necessary.
The Oblivion Empress continued to leverage the Nyxian Gap, but also controlled the most important triggers of the Black Oblivion Gate.
The Beast of Fear kept the remnant souls in check while also remaining on guard against attacks.
Master Willix precisely timed and configured the two Oblivion Gates to make sure they could connect with each other.
Each of them held important responsibilities. None of them could afford to make any egregious mistakes.
The messy and suboptimal combination of mysticism and cutting-edge high technologies had the potential to do the impossible, but only if every component did their jobs without complications.